You are correct - BSD IS a spray wax no matter what they call it. I get at least a month out of all sealants and waxes I try. That is because I seldom go over a month without trying something else. I love rubbing on my car so I try something new quite often. Both a hobby and, in a way, personal therapy. I've had a Mercedes for four years now and during that time I have treated it like a garage queen. For protection and looks I used the following (each one on several occasions): Griot's Premium Wax; DP Poli-Coat; Duragloss 111; Duragloss 105 (both with bonding agent); Sonax PNS; Optimum Car Wax; Wolfgang Spritz; Collinite 845 and a few others I have forgotten. In my closet is FK1000P which will be tried next month. I can recommend them all for good protection of up to a month. After that, I have no idea what they'll do. But since every one is a quality product, my guess is they will perform well for much, much longer.
BTW, on my "Diamond White" paint I find the best shine comes from Sonax PNS and Duragloss 111. However, both are sort of antiseptic, ie, candy apple in shine. Optimum Car Wax on the other hand gives it a somewhat darker hue. 845 is similar to the Duragloss but also a little richer and at the same time more "slippery" looking. Someone once described 845 as "plastic" looking and that is about right.
What I have decided to do sometime this summer and after I try my FK wax, is use PNS after a real good prep (always use P21S Paintworks Cleanser when you do this). I will give it two coats for even coverage. Then, after every other wash (about every two weeks or so) I will give it a "topper" of BSD. And I will do that without adding further products or experimenting with anything else for one year. I am hoping that doing this will end up just as good for my car as all the other stuff I have done and used over the past four years.
